<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>
  <body>
    <script>
      // 1-100
      let sum = 0; // 累加和
      let odd = 0;
      let even = 0;
      for (let i = 1; i <= 100; i++) {
        sum += i; //sum = sum+i;
        if (i % 2 === 0) even += i;
        if (i % 2 === 1) odd += i;
      }
      console.log(sum, odd, even);
    </script>
  </body>
</html>
